4. Consider the following statement: There are small regions...

4. Consider the following statement: There are small regions on the X and Y chromosomes of humans that are homologous. This statement is a. True b. False 5. A human female is shown to have an XY karyotype. Which of the following could explain this phenotype given the karyotype? a. The individual's X chromosome has been inactivated. b. The individual may have suffered a chromosomal deletion of the X chromosome that contained the female determining region. c. The individual may have experience a deletion of a region of the Y chromosome that contained the sry gene. d. a, b or c could explain this karyotype.

Transcript

00:01 Hello students, so the given question is based upon pseudo -autosomal region, pseudo -autosomal region, and these pseudo -autosomal region, they are present in both x and y chromosomes.

00:23 Now the y chromosomes, they have many genes which are unique to it, but genes in this pseudo -autosomal region, they are present in both the sex.

00:35 Hence, p .a .r.

00:37 Or pseudo -autosomal region is present in both x and y chromosomes.

00:44 Now many genes are there which are essential for normal development.

00:49 I repeat, many genes are there which are essential for normal development like p -a -r, p -a -r that is pseudo -oosomal region 1, p -a -r -1 and p -a -r -2.

01:02 So they are essential for normal development and par 1 and par 2 the short they are the short region of homologi between the x and the y chromosome i repeat they are short region of short region of homology between between x and y chromosome between x and y chromosome between x and y chromosomes.

01:46 So they are the short region between, short region of homology between x and y chromosomes.

01:55 So, par, that is pseudo -autosomal region, they behave rather like autosome, they behave rather like autosomes and recombined during mitosis.

02:14 Thus, genes in this region are inherited in autosomal genes they are inherited in autosomal rather than strictly sex -linked inheritance, rather than strictly sex -linked inheritance.

02:46 Therefore, the answer to this statement is true.

02:52 We had to tell whether the statement given to us was true or false and the question was, there are small regions on the x and y chromosomes of humans that are homologous.

03:04 Therefore, the statement is true.

03:07 Moving on to the next question...

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